.funnelplot_wrapper {
  position: relative;
  box-sizing: border-box;
}

.funnelplot_wrapper:before {
  position: absolute;
  top: 0;
  left: 0;
  box-sizing: border-box;
  width: 50%;
  height: 100%;
  content: '';
  background: linear-gradient(45deg, white 50%, rgba(0, 0, 0, 0) 50%);
}

.funnelplot_wrapper:after {
  position: absolute;
  top: 0;
  right: 0;
  box-sizing: border-box;
  width: 50%;
  height: 100%;
  content: '';
  background: linear-gradient(-45deg, white 50%, rgba(0, 0, 0, 0) 50%);
}